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export class Resolver {
constructor(factory) {
this.factory = factory;
}
resolveWith(container) {
if (this.isConstructor()) {
return this.resolveDependenciesUsing(container);
}
else {
return this.factory(container);
}
}
parseConstructor(func) {
const code = func.toString();
const regex = /function ([a-zA-Z]*)\((.*)\) *\{/;
return code.match(regex);
}
isConstructor() {
return this.factory.name;
//return this.parseConstructor(this.factory)[1] != '';
}
resolveDependenciesUsing(container) {
const ctor = this.parseConstructor(this.factory);
const parameters = ctor.slice(2)[0].split(',').filter(Boolean);
const dependencies = parameters.map((parameter) => {
return container.resolve(parameter.trim());
});
return new this.factory(...dependencies);
}
}
export class Registration {
constructor(factory) {
this.factory = factory;
}
create(container) {
return new Resolver(this.factory).resolveWith(container);
}
asSingleton() {
const originalFactory = this.factory;
let item = null;
this.factory = (container) => {
if (item == null) {
item = new Resolver(originalFactory).resolveWith(container);
}
return item;
};
}
}
export default class Registry {
constructor() {
this.registrations = new Map();
}
register(key, factory) {
if (!this.isRegistered(key)) {
this.registrations.set(key, new Set());
}
const registration = new Registration(factory);
this.registrations.get(key).add(registration);
return registration;
}
isRegistered(key) {
return this.registrations.has(key);
}
resolve(key) {
if (!this.isRegistered(key)) {
throw `"${key}" is not registered`;
}
try {
const registration = this._registrationsFor(key)[0];
return registration.create(this);
} catch(error) {
console.error(`ERROR: Could not resolve "${key}" ${error}`);
throw error;
}
}
resolveAll(key) {
return this._registrationsFor(key).map(registration => registration.create(this));
}
_registrationsFor(key) {
return Array.from(this.registrations.get(key));
}
}
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